Home of the Oakland basketball and volleyball teams is the Athletics Center O'rena which is a part of Oakland University's Recreation and Athletics Center Complex located in the heart of campus. Site of some of the most enthusiastic crowds in the league, the atmosphere in the O'rena starts with Oakland's student section, the Grizz Gang, one of the most vocal groups among Horizon League student sections. With great sight lines from every seat, a large-scale video board, two concession areas and a merchandise center.

In April 2015 Oakland unveiled the blacktop court receiving over 10,000 votes from fans. The Golden Grizzlies have the nation's only all-black court which includes the official #WEARtheBEAR hashtag, an outline of the state of Michigan and the bear head logo at center court. A new state-of-the-art sound and light system was also installed to enhance the game day experience.

The O'rena hallway received an upgraded look in 2016 with branded walls to highlight student-athletes, major wins and events within athletics as well as five large touch-screen, high-definition monitors to display game highlights, promotional items and a digital version of the Oakland Athletics Hall of Honor. A new lighting system in the hallway was also installed and the Gold Tile Program was initiated to replace the maroon tiles while allowing friends and supporters of Oakland University & Oakland University Athletics to 'leave their footprint' with a personalized gold tile.

Groundbreaking for the facility was in the fall of 1996, with the first game occurring on Nov. 17, 1998, when Oakland hosted No. 5 Michigan State in front of a packed house of over 4,000 fans and a regional television audience. In addition to the basketball court, the facility also includes locker rooms for all of Oakland's 18 intercollegiate sports, an athletic training room, office space for the athletic department, a media room, booster room, weight room, equipment room and a 1,000-seat top-of-the-line natatorium.

Part of the campus recreation complex, the recreation side of the facility includes a three-court gym, weight training and fitness area, multipurpose/aerobic rooms, racquetball and squash courts, a wellness center and classrooms and meeting areas.

Some of the top teams in the nation have visited the O'rena for men's and women's basketball including: Auburn, Florida, Florida State, Georgia, Illinois, Kentucky, Michigan, Michigan State, Missouri, Penn State, Purdue, Tennessee and Texas A&M. Always a tough place to play for Golden Grizzlies' opponents, Oakland has won more than 70 percent of its games in the 14 seasons that the facility has been in operation, including wins over Florida State, Georgia, Illinois, Michigan and Texas A&M.

Men's Basketball Postseason
The Golden Grizzlies have won five of six postseason games they have hosted inside the O'rena. Oakland defeated Kent State, 80-74, in the quarterfinals of the 2009 CollegeInsider.com Postseason tournament, while rattling off three wins en route to the Final Four of the 2012 CIT tournament, defeating Bowling Green (86-69), Buffalo (84-76) and Rice (77-70).

Men's Basketball Notables
In its first season inside the Horizon League (2013-14), Oakland finished tied for fifth place and hosted its first-ever league tournament game as the No. 6 seed, defeating No. 7 seed Youngstown State, 96-92, in overtime. The game featured a great play call by Coach Greg Kampe that allowed Travis Bader to pick up a foul with 0.6 seconds left on the inbounds play, making both free throws and sending the game into OT. The play witnessed 1.4 million views on YouTube. The next season Kay Felder made a play against Youngstown State that made it to No. 1 on SportsCenter's Top Ten. In 2016, the O'rena one of the best moments in all of sports as Max Hooper hugged his father on Senior Day.

Women's Basketball Notables
Oakland has won eight or more home games 13 times in the 18 years at the O'rena. The Golden Grizzlies topped No. 21 Green Bay at home in the 2016-17 season in a thrilling 74-71 win on a last-second steal and layup by Sha'Keya Graves. The Golden Grizzlies also scored a single-game school record 123 points their home opener against UM Dearborn on Nov. 13, 2015, making a record 51 field goals while shooting 61.4 percent from the field.
Volleyball Notables
Since 2010, the volleyball team is 58-29 (.667) at home including three 10-home win seasons (2011, '14, '16), all of which match a program-best. The Golden Grizzlies also picked up their first-ever win over a Big Ten opponent at home in a five-set thriller over Iowa (9/1/12). The Golden Grizzlies clinched their first-ever birth to the NCAA Tournament at the O'rena in 2014 with a 3-1 win over Milwaukee in the Horizon League Championship game. Thanks to the Horizon League's agreement with ESPN, all Oakland home volleyball matches are aired nationally on the ESPN3 platform.